William James Sidis 1914 - Public domain photograph originated from Wikimedia Commons and colored by Larry Gowdy

William James Sidis is another individual whose exact IQ score is unknown. Experts have pegged his IQ somewhere in the range of 250 to 300, which would give him the highest IQ score in history. What did Sidis do to earn such an accolade? Born in 1898, he entered Harvard at the age 11 to study mathematics, which at the time made him the youngest person to ever enroll at the prestigious university. After completing his studies he began teaching, but found that the students in his class who…